Linux/Unix System Programmer with C Programming Experience

Qualysoft

Budapest Hybrid permanent

Posted: March 4, 2026

Quick Summary

We are looking for a skilled Linux/Unix System Programmer with a strong background in C programming to join our team in Budapest, Hungary. The ideal candidate will have experience with Linux/Unix systems and programming languages such as C, C++, and scripting languages. The successful candidate will be responsible for developing innovative solutions for our clients in the financial services, telecommunications, and automotive industries.

Job Description

Founded in 1999 in Vienna, the Qualysoft Group is a manufacturer-independent IT consulting and services company, which successfully provides support for its international customers with the aim of boosting their competitiveness and economic efficiency through innovative IT solutions.

Its focus is on financial services providers, telecommunications companies, the automotive industry and energy service providers. Over 400 employees in 6 subsidiaries work together to ensure state of the art solutions for our clients.

We are looking for new colleagues in Qualysoft teams for diverse projects providing continuous learning opportunities. Our common goal is to provide honesty, development and a stable background while getting to know the latest technologies. We are waiting for your application for the position below!

Tasks::
• Maintain, debug, and enhance a highly customized product derived from open-source components.
• Perform system-level programming, ensuring stability, security, and performance across platforms.
• Customize and extend open-source components such as OpenSSH and Unix/Linux authentication modules.
• Collaborate closely with a globally distributed team across New York, Canada, India, and London.
• Contribute to enterprise-grade, change-controlled development processes.
• Support migration of legacy code (Perl) to modern Python implementations.
• Assist in documenting and improving development practices for long-term product sustainability.
• Provide technical expertise to troubleshoot complex, business-critical issues.

Requirements::
• Strong Unix/Linux system programming experience with hands-on C development.
• Skilled in writing and debugging multithreaded, system-level code.
• Experience with enterprise software lifecycles, including change control and release management.
• Familiarity with open-source projects and comfortable customizing or extending them.
• Detail-oriented with a strong ownership mindset and problem-solving skills.
• Comfortable collaborating with globally distributed teams.

Nice to Have::
• Experience with Perl (legacy code) or Python (migration projects).
• Understanding of authentication systems such as Kerberos and their integration flows.

Why we think you will love working here:

With us you count as a person, our doors are always open.
We live the Qualysoft Team Spirit and stand for transparency!

Fresh wind and new ideas are welcome, because standstill is a foreign word at Qualysoft.

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